Good practice applies to risk management beyond bacterial/biological potential (E.coli etc.) of how water is sourced, where it has come from, how it is stored, for how long and in what conditions that could lead to contamination, plus how the water is used. If small droplets of water created in its use, the risk may be greater dependant on the original water source, how it has been stored, for how long etc.
If water droplets are larger, or not aerosolised, risk is negligible to health. The exception to this is the theoretical circumstance where there is rapid drying and dust created with particulates immediately after use is blown into the atmosphere.
If fine droplets are needed, potable water should be used. For instance for dust suppression in densely urban areas, or use of fan-blowers to create column of misted air within a demolition site.
Sensible precautions should be taken to avoid bacterial growth. For instance cover stored water, keep cool and avoid heat and direct sunlight. Allow waters to settle and use silt traps and filters appropriately on inflow and outflow to prevent sediment impact downstream.